Does anyone know of a good tree structure notepad for OSX? Something like MyNoteKeeper [1] on windows. The key features I have been looking for are a tree struc

Does anyone know of a good tree structure notepad for OSX? Something like MyNoteKeeper [1] on windows. The key features I have been looking for are a tree structure where each node can have text and files associated with it, and can have children nodes. [1] http://www.mynoteskeeper.com/ http://www.mynoteskeeper.com/